Terminal Group Effects on Demulsification Using Dendrimers

Wang, J.; Li, C. Q.; Qu, Haiou; Hu, Fenglian; Yang, Yajiang

doi:10.1080/10916460902936986

Cited by 9 publications

(9 citation statements)

References 21 publications

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“…The extension of the knowledge toward the air–liquid interface helps, for example, to rationalize the use of dendrimers as vehicles for the delivery of amphiphilic drugs from a hydrophilic to a hydrophobic environment or vice versa. For example, it was found previously that PAMAM dendrimers of generations 1 to 3 can act as nanocontainers for the natural surfactants present in emulsions and that the demulsification efficiency increases with the dendrimer generation . Therefore, the findings from the present work are also relevant to other applications of dendritic polyelectrolytes such as demulsification agents for the recovery of raw oil from oil–water emulsions.…”

Section: Discussionmentioning

confidence: 51%

“…For example, it was found previously that PAMAM dendrimers of generations 1 to 3 can act as nanocontainers for the natural surfactants present in emulsions and that the demulsification efficiency increases with the dendrimer generation. 27 Therefore, the findings from the present work are also relevant to other applications of dendritic polyelectrolytes such as demulsification agents for the recovery of raw oil from oil−water emulsions. Through building on these findings, one could also imagine applications of dendrimers as antifoaming agents that sequester surfactants and hence reduce foaming.…”

Section: ■ Discussionmentioning

confidence: 88%

“…Other promising applications include gene vectors, 23,24 biosensors, 25 and water purification 26 and demulsification reagents. 27 The interactions of PAMAM dendrimers with SDS have been studied previously in bulk solutions 28−30 and at the silica− water interface. 5 To our knowledge, however, a systematic study concerning the interactions of dendritic polyelectrolytes and amphiphiles at the air−water interfaces has not to date been carried out.…”

Section: ■ Introductionmentioning

confidence: 99%

“…PAMAM dendrimers have been investigated as potential nanocarriers as a result of their ability to host small hydrophobic or amphiphilic molecules in their interior. Other promising applications include gene vectors, , biosensors, and water purification and demulsification reagents …”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Mixtures of Poly(amidoamine) Dendrimers and Sodium Dodecyl Sulfate at the Air–Water Interface

2014

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We relate the adsorption from mixtures of well-defined poly(amidoamine) (PAMAM) dendrimers of generations 4 and 8 with sodium dodecyl sulfate (SDS) at the air-water interface to the bulk solution properties. The anionic surfactant shows strong attractive interactions with the cationic dendrimers at pH 7, and electrophoretic mobility measurements indicate that the association is primarily driven by electrostatic interactions. Optical density measurements highlight the lack of colloidal stability of the formed bulk aggregates at compositions close to charge neutrality, the time scale of which is dependent on the dendrimer generation. Adsorption at the air-water interface was followed from samples immediately after mixing using a combination of surface tension, neutron reflectometry, and ellipsometry measurements. In the phase separation region for dendrimers of generation 4, we observed high surface tension corresponding to a depleted surfactant solution but only when the aggregates carried an excess of surfactant. Interestingly, these depleted adsorption layers contained spontaneously adsorbed macroscopic aggregates, and these embedded particles do not rearrange to spread monomeric material at the interface. These findings are discussed in relation to the interfacial properties of mixtures involving dendrimers of generation 8 as well as polydisperse linear and hyperbranched polyelectrolytes where there is polyelectrolyte bound to a surfactant monolayer. The results presented here demonstrate the capability of dendrimers to sequester anionic surfactants in a controllable manner, with potential applications as demulsification and antifoaming agents.

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Section: Discussionmentioning

confidence: 51%

Section: ■ Discussionmentioning

confidence: 88%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adsorption of Mixtures of Poly(amidoamine) Dendrimers and Sodium Dodecyl Sulfate at the Air–Water Interface

2014

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“…In particular, a higher generation of commercialized polyamidoamine (PAMAM) (G > 2.0) dendrimers were reported to exhibit fast and efficient demulsification properties benefiting from their terminal amine groups and molecular weights. Moreover, taking advantage of their empty interiors, PAMAM molecules can act as nanocontainers to attract and dissolve adsorbents left on the oil-water interface [25][26][27]; otherwise, they must undergo a lengthy and costly synthesis process [28][29][30]. As another subclass of dendritic polymers, hyperbranched PAMAMs could potentially be applicable demulsifiers due to their similar structures to perfect dendrimers in terms of their interior branches and peripheral functional groups [31,32].…”

Section: Introductionmentioning

confidence: 99%

The Demulsification Properties of Cationic Hyperbranched Polyamidoamines for Polymer Flooding Emulsions and Microemulsions

Tan

Wang

et al. 2020

Processes

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Polymer flooding emulsions and microemulsions caused by tertiary oil recovery technologies are harmful to the environment due to their excellent stability. Two cationic hyperbranched polyamidoamines (H-PAMAM), named as H-PAMAM-HA and H-PAMAM-ETA, were obtained by changing the terminal denotation agents to H-PAMAM, which was characterized by 1H NMR, FT-IR, and amine possession, thereby confirmed the modification. Samples (300 mg/L) were added to the polymer flooding emulsion (1500 mg/L oil concentration) at 30 °C for 30 min and the H-PAMAM-HA and H-PAMAM-ETA were shown to perform at 88% and 91% deoil efficiency. Additionally, the increased settling time and the raised temperature enhanced performance. For example, an oil removal ratio of 97.7% was observed after dealing with the emulsion for 30 min at 60 °C, while 98.5% deoil efficiency was obtained after 90 min at 45 °C for the 300 mg/L H-PAMAM-ETA. To determine the differences when dealing with the emulsion, the interfacial tension, ζ potential, and turbidity measurements were fully estimated. Moreover, diametrically different demulsification mechanisms were found when the samples were utilized to treat the microemulsion. The modified demulsifiers showed excellent demulsification efficiency via their obvious electroneutralization and bridge functions, while the H-PAMAM appeared to enhance the stability of the microemulsion.

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Syntheses and Catalytic Behavior of Dendritic Macrocyclic Schiff‐Base Nickel (II) Complexes in Ethylene Oligomerization

et al. 2023

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The functionalized dendrimers play an important role in catalytic application. A dendritic Schiff base macrocyclic compound was designed and synthesized with the 1.0 generation dendrimer polyamidoamine (1.0G PAMAM) and terephthalaldehyde for ethylene oligomerization. The role of solvent in the synthesized process of dendritic macrocyclic Schiff base ligand was studied. Surprisingly, intermolecular or intramolecular cyclization occurred and formed bicyclic Schiff base ligand (Ligand 1) and polycyclic Schiff base ligand (Ligand 2). And their corresponding nickel complexes (Catalyst 1 and Catalyst 2) were also synthesized with NiCl2(DME) as material to be used for ethylene oligomerization. The effects of the reaction parameters and the chemical structure of the ligand on the catalytic behavior were investigated with methyl‐aluminoxane (MAO) as cocatalyst, and Catalyst 1 and Catalyst 2 displayed the high catalytic activity and the high selectivity for low‐carbon olefin in ethylene oligomerization. Catalyst 2 based on Ligand 2 had a higher catalytic activity of 9.12×104 g (mol Ni h)−1 in ethylene oligomerization because of large dendritic ring in the ligand for ethylene diffusion and mass transfer. Moreover, two synthesized nickel complexes based on dendritic macrocyclic Schiff base ligand had a higher catalytic activity compared with the corresponding dendritic salicylaldehydeimine nickel (II) catalyst.

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Terminal Group Effects on Demulsification Using Dendrimers

Cited by 9 publications

References 21 publications

Adsorption of Mixtures of Poly(amidoamine) Dendrimers and Sodium Dodecyl Sulfate at the Air–Water Interface

Adsorption of Mixtures of Poly(amidoamine) Dendrimers and Sodium Dodecyl Sulfate at the Air–Water Interface

The Demulsification Properties of Cationic Hyperbranched Polyamidoamines for Polymer Flooding Emulsions and Microemulsions

Syntheses and Catalytic Behavior of Dendritic Macrocyclic Schiff‐Base Nickel (II) Complexes in Ethylene Oligomerization

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